Ginkgo biloba  "Finger" was perportedly discovered as a broom growing on another Ginkgo, unfortunatley we do not know which one or the precise origin.
 
Description – Ginkgo biloba "Finger" is a dwarf male. It is a compact very slow growing, form. The growth rate is reported as being as little as 3 cm a year, however he plant in The National Collection of Ginkgo biloba and Cultivars, puts on approximately 25 cm a year.  Leaves have long petioles, typically fan-shaped, deeply divided and light green in colour. Crown is rounded, eventually irregular. Generally, the height is dependent on at what height the plant was worked. It suggested that it should attain a height of 1.5m with a spread of 0.5 m to 0.7 m in 10 years.